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The soft pion correction at high energy may play a crucial role innon-perturbative parts of sea quark distributions. In this paper, we show that,while the soft pion correction for the strange sea qaurk distribution issuppressed in the large and the medium $x$ region compared with that for the upand the down sea quark one, it can become large and SU(3) flavor symmetric inthe very small $x$ region. This gives us a good reason for the symmetryrestoration of light sea quark distributions required by the mean charge sumrule for the light sea quarks. Then, by estimating this sum rule with the helpof the results obtained by the soft pion correction, it is argued that there isa large symmetry restoration of the strange sea quark in the region from$x=10^{-2}$ to $10^{-6}$ at $Q^2\sim 1$ GeV.Comment: 22 pages including 4 eps figures, ReVTeX, to appear in Phys. Rev.

Symmetry restoration of the soft pion corrections for the light sea quark distributions in the smallxregion